Functional Groups pKa values

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Last updated 5:18 AM on 9/22/26
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18 Terms

1
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HBr (hydrogen bromide) pKa

-9

2
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HCl (hydrogen chloride) pKa

-8

3
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Sulfuric acid (H2SO4) pKa

-3

4
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Hydronium (H3O+) pKa

0

5
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Anilinium ion (Ph-NH3+) pKa

4.6

6
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Carboxylic acid (R-COOH) pKa

4.76

7
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Hydrogen sulfide (H2S) pKa

7

8
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1,3-Dicarbonyl / beta-diketone alpha H (ESTER) pKa


9

9
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Ammonium ion (NH4+) pKa

9.3

10
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Phenol (Ar-OH) pKa

9.9

11
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Water (H2O) pKa

14

12
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Alcohol (R-OH) pKa

16

13
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Tertiary alcohol (tert-butanol) pKa

18

14
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Alpha hydrogen next to ketone (C=O) pKa

19.2

15
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Terminal alkyne (C≡C-H) pKa

25

16
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Ammonia (NH3) pKa

38

17
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Alkene C-H pKa

44

18
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Alkane C-H pKa

50